On 08/02/2017 05:17 PM, Franklin S Cooper Jr wrote:
> This patch adds PM runtime support to the I2C Davinci driver.
>
> Reviewed-by: Grygorii Strashko <grygorii.strashko at ti.com>
> Signed-off-by: Franklin S Cooper Jr <fcooper at ti.com>
> Signed-off-by: Sekhar Nori <nsekhar at ti.com>
> ---
> drivers/i2c/busses/i2c-davinci.c | 61 ++++++++++++++++++++++++++++++++++------
> 1 file changed, 53 insertions(+), 8 deletions(-)
>
> diff --git a/drivers/i2c/busses/i2c-davinci.c b/drivers/i2c/busses/i2c-davinci.c
> index 5749aac..62ff869 100644
> --- a/drivers/i2c/busses/i2c-davinci.c
> +++ b/drivers/i2c/busses/i2c-davinci.c
> @@ -36,6 +36,7 @@
> #include <linux/gpio.h>
> #include <linux/of_device.h>
> #include <linux/platform_data/i2c-davinci.h>
> +#include <linux/pm_runtime.h>
>
> /* ----- global defines ----------------------------------------------- */
>
> @@ -122,6 +123,9 @@
> /* set the SDA GPIO low */
> #define DAVINCI_I2C_DCLR_PDCLR1 BIT(1)
>
> +/* timeout for pm runtime autosuspend */
> +#define DAVINCI_I2C_PM_TIMEOUT 1000 /* ms */
> +
> struct davinci_i2c_dev {
> struct device *dev;
> void __iomem *base;
> @@ -541,10 +545,17 @@ i2c_davinci_xfer(struct i2c_adapter *adap, struct i2c_msg msgs[], int num)
>
> dev_dbg(dev->dev, "%s: msgs: %d\n", __func__, num);
>
> + ret = pm_runtime_get_sync(dev->dev);
> + if (ret < 0) {
> + dev_err(dev->dev, "Failed to runtime_get device: %d\n", ret);
> + pm_runtime_put_noidle(dev->dev);
> + return ret;
> + }
> +
> ret = i2c_davinci_wait_bus_not_busy(dev);
> if (ret < 0) {
> dev_warn(dev->dev, "timeout waiting for bus ready\n");
> - return ret;
> + goto out;
> }
>
> for (i = 0; i < num; i++) {
> @@ -552,14 +563,19 @@ i2c_davinci_xfer(struct i2c_adapter *adap, struct i2c_msg msgs[], int num)
> dev_dbg(dev->dev, "%s [%d/%d] ret: %d\n", __func__, i + 1, num,
> ret);
> if (ret < 0)
> - return ret;
> + goto out;
> }
>
> + ret = num;
> #ifdef CONFIG_CPU_FREQ
> complete(&dev->xfr_complete);
> #endif
>
> - return num;
> +out:
> + pm_runtime_mark_last_busy(dev->dev);
> + pm_runtime_put_autosuspend(dev->dev);
> +
> + return ret;
> }
>
> static u32 i2c_davinci_func(struct i2c_adapter *adap)
> @@ -599,6 +615,9 @@ static irqreturn_t i2c_davinci_isr(int this_irq, void *dev_id)
> int count = 0;
> u16 w;
>
> + if (pm_runtime_suspended(dev->dev))
> + return IRQ_NONE;
> +
> while ((stat = davinci_i2c_read_reg(dev, DAVINCI_I2C_IVR_REG))) {
> dev_dbg(dev->dev, "%s: stat=0x%x\n", __func__, stat);
> if (count++ == 100) {
> @@ -802,7 +821,6 @@ static int davinci_i2c_probe(struct platform_device *pdev)
> dev->clk = devm_clk_get(&pdev->dev, NULL);
> if (IS_ERR(dev->clk))
> return PTR_ERR(dev->clk);
> - clk_prepare_enable(dev->clk);
>
> mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> dev->base = devm_ioremap_resource(&pdev->dev, mem);
> @@ -811,6 +829,17 @@ static int davinci_i2c_probe(struct platform_device *pdev)
> goto err_unuse_clocks;
> }
>
> + pm_runtime_enable(dev->dev);
> + pm_runtime_set_autosuspend_delay(dev->dev,
> + DAVINCI_I2C_PM_TIMEOUT);
> + pm_runtime_use_autosuspend(dev->dev);
Pls, move autosuspend configuration before pm_runtime_enable()
> +
> + r = pm_runtime_get_sync(dev->dev);
> + if (r < 0) {
> + dev_err(dev->dev, "failed to runtime_get device: %d\n", r);
> + goto err_unuse_clocks;
> + }
> +
Otherwise looks good to me.
--
regards,
-grygorii